i played around with a homemade biofeedback machine years ago before they became big business - a friend of mine was building them in his garage and i got to play with one (he went on to patent some parts of it, so good for him) - i could make it change waves by thinking high and low - like being on a ladder of energy and climbing up or down from where i was - that is how you change waves, so you could use that idea as how to separate them- i put some about it in the short story 'joe's journey to richmond':
http://www.esotericha.com/joe.pdf - good luck with it - it's there, you just have to find it, kinda like trying to wiggle your ears, you just keep trying and one day you find the right thing to wiggle
btw, the new toshiba satellite is now up and running on fedora 9!!!!! - i now have working computer again, yay!!!!!!! - boy, the touchpad sure gets hot! - i am now officially back online (until i get fed up or something breaks again lol)
good luck and enjoy the quest, it is still the best part of life